Key Lime Fudge

Today I’m sharing what is a very spring-like recipe for Key Lime Fudge.  Scroll to the end of this post to watch a short how-to video showing you how to make this fudge, and then you can print out the recipe and make it at home.

key lime fudge stacked

The best part of spring is the green.  Where I live now (in Arizona) everything turns rather brown and lifeless in the summer.  The lawn goes dormant, only the dessert flowers survive, and most of the rest of the plants drop their leaves.  It’s not such a pretty sight.  Winter and spring are good for Arizona.  Rain comes now and then, and everything is much more green and vibrant.  Green is where it’s at.  Green makes me happy.  Key Lime Fudge is barely green, but it makes the cut and it’s a yummy spring green confection.

Key Lime Fudge on a green plate

Have you ever picked up a bag of key limes?  They’re awfully cute.  They’re tiny little things.  You’ve gotta squeeze the heck out of them to get every bit of their juice, but it’s all worth it.  They have a stronger scent and a thinner rind than the typical lime.  The flavor is more tart and bitter.  These limes present themselves nicely in sweet treats (like key lime pie!) since the sugar balances out that tart flavor and highlights the unique flavor of the key lime.  I love them!

Key Lime Fudge

You can most certainly use regular limes for this fudge.  They might give the fudge a slightly sweeter flavor, but all will still be good.  Don’t skimp on the lime zest in this recipe since it gives the fudge a fabulous green tint, and it adds a good amount of lime flavor to the recipe too.  So if you’re wishing for a little “spring” in your life and it hasn’t quite arrived yet, treat yourself to some Key Lime Fudge instead.

Click below to watch a short video showing you how to make Key Lime Fudge, then scroll to the bottom to print out the recipe and make it at home.

5 from 2 votes

Key Lime Fudge

This Key Lime Fudge recipe is the perfect blend of sweet and sour!

Prep Time 15 minutes
Cook Time 8 minutes
Total Time 23 minutes
Servings 36 pieces
Calories 100 kcal


  • 5 ounce can 2% evaporated milk
  • 1 2/3 cups granulated white sugar
  • 1/2 teaspoon salt
  • 12 large marshmallows
  • 2 cups white chocolate chips
  • 1/4 cup grated lime zest (about 5 limes)
  • 2 tablespoons key lime juice (5 to 7 limes, juiced)


  1. Line an 8" x 8" square pan with aluminum foil; grease the foil with butter. It's not a good recipe for a 9-inch square pan as the fudge will be too thin.
  2. Combine the milk, sugar and salt in a large heavy saucepan over medium heat. Stir and bring to a boil; boil 8 minutes, stirring constantly at a boil (if you have a candy thermometer, you can bring it to the soft-ball-stage, but I didn't use one). Remove the pan from heat. Add the marshmallows, chocolate, zest and juice, and stir until the marshmallows and chocolate are melted and the mixture is smooth. Scrape the fudge into the prepared pan. Tip the pan to make sure the fudge covers the bottom evenly. Cool completely, then cut into 1-inch squares.

Recipe Notes

*This recipe can be made with regular limes too.

Nutrition Facts
Key Lime Fudge
Amount Per Serving (1 piece)
Calories 100 Calories from Fat 27
% Daily Value*
Total Fat 3g 5%
Saturated Fat 1g 5%
Cholesterol 2mg 1%
Sodium 47mg 2%
Potassium 28mg 1%
Total Carbohydrates 17g 6%
Sugars 16g
Vitamin A 0.1%
Vitamin C 0.3%
Calcium 2.1%
Iron 0.2%
* Percent Daily Values are based on a 2000 calorie diet.

Here are a few more desserts using key limes that you might enjoy:

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  • Jeanne Collins wrote:

    Can I use fat free evaporated milk instead of the 2%?? Apparently, here in the South we only have the regular or fat free. Cant seem to find the 2%. Thanks for any advice!!

    • Lori Lange wrote:

      I am not sure about fat-free because I haven’t tried it!

  • Natalie wrote:

    These fudge bars look so delicious and so easy to make! I love the idea of making key lime fudge – sounds yummy!

  • Cat Lennon wrote:

    Ripe key limes are yellow (and because the rind is so thin, almost impossible to zest)  so I assume the zest is from regular limes? 

    Also the riper they are the easier to juice so if try to buy yellow ones.  Unfortunately they package them in those green mesh bags which make it hard to tell. 

  • shifu wrote:

    Thanks Lori. I’ll try it this weekend. Perfect spring snack 🙂

  • Michelle wrote:

    This looks amazing!

    Question: does the recipe actually call for 1/4 CUP of zest, or is this a typo? Especially wondering since five tiny key limes would hardly produce that much. 

    • Lori Lange wrote:

      yes! Zest away!

  • Peggy wrote:

    We bought some key lime fudge when we were in the Keys a couple of weeks ago. Oh my gosh I love that place. The fudge was very good and so I have been wanting to make some. I make Key Lime pies when we have get togethers. Usually a special request from my great niece. I also always have a bottle or two of Nellie and Joes Key Lime juice in my fridge. Thank you for the recipe. Can’t wait to try it.